Without requiring special tools or water, Sika® Post Fix 2-part, pre-proportioned polyurethane resin produces expanding foam when mixed. Set time is 3 min for this mix-in-the-bag backfill, which is suited for securing wood, PVC, steel, or concrete in-ground posts and hardens completely in 2 hr. Once mixed and in foam state, product is inert and will not leach into soil. Also, chemical formulation will not harm soil or surrounding environment, and excess material can be cut away with knife.